Table 1.
Patient cohort characteristics.
Fig 1.
Heatmap of trauma admissions by time of day versus day of week.
Each block of the heatmap represents a one hour block of one day of the week over the three year study period. The color corresponds to the relative frequency of contacts per hour as described by the color bar to the right of the image, where 1 represents the mean number of trauma contacts per hour. Weekend days have more trauma than weekdays, P<0.001. Mornings (4AM– 8AM) have less trauma than evenings (4PM– 8PM) on all days of the week, P<0.001.
Fig 2.
Absolute frequency of trauma patients sent from the emergency department to each of these disposition by time of day.
Patients admitted to the floor peak earliest (red-dashed). Step-down (purple-dashed) and ICU (yellow-dashed) peak next during the day, and operative patients present latest.
Fig 3.
Absolute frequency of trauma admissions versus time of day partitioned by blunt and penetrating and divided by injury severity score.
Fig 4.
Smoothed, normalized relative trauma frequency per day throughout the year.
All trauma (blue) shows above-median trauma during mid year. Several of mechanisms of injury (see legend) are considered additionally. The first point marks the date (day 95: April 5th) that this institution tends to see its median number of traumas. The second point (day 310: November 6th) denotes the end of the above-median yearly peak in trauma contacts per day.